Unit 2: Structure + Functions Of Blood vessels
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What is a simple code that can be used to memorise the vessels which dictate the flow of blood ?
Arteries = Away from the heart veINs= INto the heart
What is the lumen ?
The central cavity of a blood vessel
What is the endothelium?
The lining of the central cavity of a blood vessel ( the lumen )
True of False ? The pressure of the blood in arteries is low
False , it’s higher as they are carrying the oxygenated blood away from the heart
What structural feature of arteries accounts for the surge of blood passing through them?
An outer layer of the connective walls that contains an elastic fibres that stretch and recoil
How does vasodilation and vasoconstriction each affect the Lumen of a blood vessel ?
Vasodilation : Widens lumen increasing the blood flow Vasoconstriction: Narrows lumen , decreasing blood flow
In a Vein what lines the lumen ?
Endothelial cells
Why are valves found in veins ?
To prevent the backflow of blood
What structural feature allows for the capillaries to exchange substances?
It’s thin walls
True or False ? The endothelium is one cell thick in capillaries
True
What allows for the blood plasma to become tissue fluid ?
Pressure filtration that pushes the blood plasma through the capillary wall and into the surrounding cells
What is the lymphatic system?
A system that transports lymph around the body and eventually returns it to the bloodstream